Fragility of Bench-Mounted Equipment Considering Uncertain Parameters
Publication: Journal of Structural Engineering
Volume 132, Issue 6
Abstract
This paper presents analytically developed seismic fragility curves for unattached bench-mounted equipment considering representative building, bench, and equipment interface properties. The emphasis of the study is on rigid scientific equipment, which is often placed on the surface of ceramic laboratory benches in science laboratories or other buildings. The paper first addresses the inherent uncertainty in the frictional behavior of the equipment supported on benches (defined by the static and kinetic coefficients of friction, and , respectively) and then describes the resulting variability of their sliding response when subjected to earthquake motions. Seismic fragility curves are generated for these types of equipment, considering 32 short distance ground motions of different hazard levels, propagated through three different building models. It is observed that although the variation in response is highly sensitive to the uncertainty in and , this variability does not propagate to the fragility curves. Moreover, accounting for the supporting bench and building characteristics are shown to significantly affect the shape and distribution of the fragility curves. From these results, considerations for design are proposed.
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Acknowledgments
Support of this work was provided in part by the Earthquake Engineering Research Centers Program of the National Science Foundation, under Award No. NSFEEC-9701568 through the Pacific Earthquake Engineering Research Center (PEER). Helpful comments and suggestions by Dr. Mary Comerio, Test Bed Manager; ground motions provided Dr. Paul Sommerville and the RC building floor level time histories provided by Dr. Khalid Mosalam are greatly appreciated. The assistance of Mr. Bob Kazanjy, Development Engineer, and other research staff of the Structural Engineering Test Hall (SETH) at the University of California, Irvine are greatly appreciated.
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© 2006 ASCE.
History
Received: Apr 29, 2003
Accepted: Sep 1, 2005
Published online: Jun 1, 2006
Published in print: Jun 2006
Notes
Note. Associate Editor: Panos Tsopelas
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